| Front | Describe how the tissues in the gaseous exchange system contribute to the functioning of the lungs (8) |
|---|---|
| Back | Cartilage- In trachea and holds the airways open and prevents them from collapsing and bursting due to air pressure changes. Goblet cells- secrete mucus to trap bacteria, pollen and dust particulates. Ciliated epithelium- waft the mucus Blood vessels- supply oxygen to respiring cells, surround the alveoli to shorten the diffusion pathway for rapid gas exchange. The good blood supply maintains a concentration gradient for increased rate of diffusion. The capillary walls are thin hence shorten diffusion pathway Squamous epithelium- Alveolus wall is thin which shorten the diffusion pathway. Due to lots of alveoli in the lungs, it creates a large surface area. Elastin- stretches during inhalation and prevents alveoli from bursting. Elastin recoils to help force air out of the lungs during expiration. |
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